this post was submitted on 15 Jun 2023
11 points (100.0% liked)

Selfhosted

40018 readers
769 users here now

A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.

Rules:

  1. Be civil: we're here to support and learn from one another. Insults won't be tolerated. Flame wars are frowned upon.

  2. No spam posting.

  3. Posts have to be centered around self-hosting. There are other communities for discussing hardware or home computing. If it's not obvious why your post topic revolves around selfhosting, please include details to make it clear.

  4. Don't duplicate the full text of your blog or github here. Just post the link for folks to click.

  5. Submission headline should match the article title (don’t cherry-pick information from the title to fit your agenda).

  6. No trolling.

Resources:

Any issues on the community? Report it using the report flag.

Questions? DM the mods!

founded 1 year ago
MODERATORS
ruud@lemmy.world
Loki@lemmy.world
CannaVet@lemmy.world
devve@lemmy.world
HybridSarcasm@lemmy.world
HybridSarcasm@lemmy.hybridsarcasm.xyz
11
How would you resolve this issue: Your server's internet randomly becomes inaccessible until reboot. (Ubuntu 22.04, Netplan) (forum.stellarcastle.net)
submitted 1 year ago* (last edited 1 year ago) by Dax87@forum.stellarcastle.net to c/selfhosted@lemmy.world
35 comments fedilink hide all child comments
 

I've been having this issue very sporadically (sometimes a couple times a week, sometimes once a month). I'm curious as to how the more veteran folk here would try and narrow down the cause of this issue.

I can provide more info if needed!

Edit: More Info:

  • Using a static IP (no DHCP) through Netplan.
you are viewing a single comment's thread
view the rest of the comments
[–] bunny@lemm.ee 2 points 1 year ago (3 children)

Are you able to access the server's Linux shell via KVM or out-of-band management during the Internet outage? If so, I would first check the kernel log for any errors. I'd then follow up with a PING to the local gateway within the same IP subnet to validate Ethernet connectivity. After that I'd start performing PINGs and traceroutes to subnets beyond the local gateway to see what's going on with tcpdump capturing all interface traffic in the background.

[–] Dax87@forum.stellarcastle.net 2 points 1 year ago (2 children)

I am able to access the Linux shell locally or on the local area network. From within I can ping the gateway, but nothing beyond that.

Is there a tracert equivalent for Ubuntu?

I will say I get this error when trying to ping www.google.com:

ping: unknown host

[–] bunny@lemm.ee 2 points 1 year ago (1 children)

The tracert equivalent that I use would be traceroute or mtr. If you can get a response from the gateway and access the server locally, it would indicate an IP routing issue as local subnet traffic is working.

Instead of pinging a domain name, what happens if you ping a public IP like Google DNS (8.8.8.8)? The error you're seeing could be related to a DNS resolution issue although that should not affect access to your server.

[–] Dax87@forum.stellarcastle.net 2 points 1 year ago* (last edited 1 year ago)

Ill try that next time it hiccups. I was thinking I should have pinged an IP address after I was pasting the unknown host error 🙃.

In further hindsight I shouldn't have restarted the server so I could try the things during our conversation. 🙁